A prominent Sunni sheikh was targeted for assassination after
he led Eid prayers today in Baghdad. He survived, but others in his convoy
did not. Due to the Eid al-Fitr celebrations — which were delayed when the new
moon was not sighted as expected — very few attacks have been reported over
the holiday weekend. In this one attack, five people were killed and four
were wounded.

A prominent Sunni cleric, al-Sumaidaie at one time lead a
Salafist group that called for attacks against U.S. troops. He returned last
year, from Syria, to work on reconciliation efforts between Sunnis and Shi’ites.
It is perhaps these efforts that made him a target.

Eid al-Fitr celebrations were 'delayed when the new moon was not sighted as expected'?

What does that mean? The lunar month is either 29 or 30 days. After 29 days of Ramadan, if the moon is sighted, then Ramadan ends and Eid begins. If it is not sighted, then there is a 30th day of Ramadan, after which the Eid begins. Ramadan is either 29 or 30 days, and we never know which it's going to be until the night after the 29th day; it's not as if it was supposed to be one day but got delayed.

(There are also those who refer to astronomical calculations; if anything, they usually complain that the beginning of the month was announced after 29 days when it should have been 30. In any case, it's not a matter of delaying an expected Eid.)